2012 results about "Methylene bisacrylamide" patented technology

A hydrogel for use as a prosthetic device for supplementing, augmenting or replacing cartilage in the intra-articular cavity of a joint and for treatment or prevention of arthritis. The hydrogel may be a polyacrylamide hydrogel obtained by combining acrylamide and methylene bis-acrylamide. A prosthetic device comprising the polyacrylamide hydrogel is also disclosed.

The invention discloses postoperation anti-adhesion hydrogel and a preparing method thereof. The hydrogel is prepared from sodium alginate powder, chitosan powder, acrylamide monomers, N,N'-methylene bisacrylamide, calcium sulfate, ammonium persulfate and N,N,N',N'-tetramethylethylenediamine. The preparing method of the high-strength high-tenacity chitosan and sodium alginate compound hydrogel is easy to operate, parameters are controllable, the materials are easy to obtain, and the solvent is nontoxic or low in toxicity and safe to treat and use; the method integrates advantages of the two natural biological materials, and the requirement for postoperation adhesion prevention of patients and the requirement for nursing care and treatment of medical workers can be met well. The hydrogel is soft, can be attached to the skin easily, has good flexibility and can effectively prevent wound surface adhesion and be degraded and absorbed, secondary trauma is avoided, and the hydrogel is expected to become a novel postoperation anti-adhesion material.

The invention relates to an inverse emulsion polymer thickener for a fracturing fluid and a preparation method thereof. The thickener is polymerized by water, 2-acrylamidyl-2-methyl sodium proparesulfonic acid liquid with mass fraction of 50%, alkyl acrylamide, acrylamide, a cationic monomer, N, N-methylene bisacrylamide, a tween-80 emulsifier, ethylene diamine tetraacetic acid disodium salt, 30% sodium hydroxide, white oil, acrylic ester, a span-80 emulsifier, sulfite, a peroxysulphate initiator, a water-soluble azo initiator and OP-15. According to the invention, raw materials are industrial products, and purification is not needed before reaction; polymerization is initiated by initiators by adding a complexing agent, and the preparation process is simple; the thickener provided by the invention is fast in dispersing, easy to prepare, free from pollution and harm, small in use level and good in stability, in particular resists high temperature of 220 DEG C, and is suitable for fracturing a high-temperature stratum; and the thickener is higher in shear resistance, can meet the fracturing construction of high flow, has high sand carrying performance, and is free from residue and is not harmful to the reservoir.

The invention relates to a temporary plugging agent for a medium/high-temperature (80-100 DEG C) oil-gas reservoir. The temporary plugging agent is prepared from the following components in percentage by mass: 2-20% of acrylamide, 0.02-0.5% of N,N-methylene-bisacrylamide, 0.005-0.03% of polymerization inhibitor, 0.05-0.3% of thickener, 0.005-1.0% of initiator, 0.1-10% of viscosity breaker and thebalance of water. The initiator is azobis(isobutylamidine hydrochloride), azodiisopropyl imidazoline or azodiisopropyl imidazoline hydrochloride; and the viscosity breaker is hydrogen peroxide, peracetic acid or peracetate. The temporary plugging agent can form high-strength gel under medium/high-temperature stratum conditions, can gelatinize within the specified time and thoroughly break the viscosity, does not damage the stratum after viscosity breaking, and can adapt to sectionalized reconstruction, repeated reconstruction and turning reconstruction of a long well interval of a medium/high-temperature oil-gas reservoir as well as temporary plugging operation of the well interval and stratum in need of temporary plugging.

The invention relates to hydrolysable high elasticity well workover liquid temporary blocking agent used in oil field workover treatment. It is made up of 40-80% de-ionized water, 10-30% acrylic acid, 8-30% starch, 0.1-1.5% sodium per-sulfate, and 0.1-1.0% N,N-methylene-bisacrylamide. The water-bearing of the product is 40%-80%. It can be degraded easily in water, and can lose full strength in 24 hours below 60 centigrade degree. The degraded residue is little and has low system viscosity.

The invention discloses graphene aerogel and a hybrid composite material thereof as well as a preparation method and application of the of graphene aerogel. The preparation method comprises the following steps: 1) mixing graphene oxide, a reducing agent, acrylamide, N,N-methylene-bisacrylamide and potassium persulfate and reacting to obtain partially-reduced graphene/polyacrylamide hydrogel; 2) carrying out pre-freezing and reduction on the partially-reduced graphene/polyacrylamide hydrogel in sequence to obtain graphene/polyacrylamide hydrogel; 3) dialyzing and drying the graphene/polyacrylamide hydrogel in sequence to obtain the graphene aerogel. The graphene aerogel has the characteristics of uniform cellular structure and light weight, excellent resilience, relatively high mechanical strength and good solvent resistance; a preparation process is simple, rapid and low in cost; the graphene aerogel can also be used for preparing polymer/graphene composite aerogel, nanoparticle/graphene composite aerogel and polymer/graphene composite materials and the like, so that application of the graphene aerogel is expanded.

The invention discloses a method for preparing high-strength polyvinyl alcohol-based dual-network hydrogel. The method comprises the following steps: taking polyvinyl alcohol as an initial raw material, and heating for dissolving, so as to obtain polyvinyl alcohol aqueous solution; adding metric acrylamide, acrylic acid, a cross-linking agent N'-N-methylene bisacrylamide and an initiator Irgacure2959 into the polyvinyl alcohol solution, and heating for dissolving, so as to obtain a uniform solution; freezing the solution in a low-temperature environment so as to obtain a physical cross-linked network structure of polyvinyl alcohol; performing photo-initiation under ultraviolet light so as to obtain chemically cross-linked polyacrylamide-acrylic acid chemical cross-linking structure, and constructing the high-strength polyvinyl alcohol-based dual-network hydrogel. The physical cross-linked and chemical cross-linked dual-network structures can be sequentially constructed by a one-step process. The preparation method provided by the invention is simple and feasible, the high-strength hydrogel of any shape can be constructed, and the prepared dual-network hydrogel is excellent in mechanical property.

The invention discloses a modified petroleum coke granule composite profile control water blocking agent and a multi-round bidirectional blocking control technology. The water blocking agent comprises agents A, B and C, the agent A comprises the ingredients: polyacrylamide solution with the concentration of 0.1-0.3% (by weight), sodium silicate, aluminum potassium sulfate, hydrochloric acid with the concentration of 30% ( by weight), and calcium chloride, the agent B comprises polyacrylamide solution with the concentration of 0.1-0.3% (by weight), modified petroleum coke granules of 20-800mum and surfactant, and the agent C comprises the ingredients: polyacrylamide solution with the concentration of 0.3-0.7% (by weight), N-N' methylene bisacrylamide, organic chromium crosslinking agent, and thiocarbamide; and the multi-round bidirectional blocking control technology is of a multi-round bidirectional blocking control measure developed according to geologic features, state and oil producing conditions of different regions of oil fields; and the water blocking agent is matched with the blocking control technology, so that the problems that the conventional profile control water blocking agent is low in strength, and bad in anti-erosion property and shearing resistance property can be solved, further digging of remaining petroleum is conducted, the water content ratio of an oil well can be reduced, the effect of displacement in flooding can be improved, and the production demand of the oil field can be met.

The invention discloses a polyacrylamide microgel as well as a preparation method and application thereof. The particle size of the polyacrylamide microgel is 30-150 micrometers, acrylamide, sodium acrylate, N,N'-bisacrylamide, 2-acrylamide-2-methylpropanesulfonic acid sodium, styrenesulfonate and the like serve as polymerized monomers, white oil and the like serve as disperse phases, and the polymerized monomers and the disperse phases are subjected to thermal initiation suspension polymerization to obtain the polyacrylamide microgel. The polyacrylamide microgel synthetized by the method can be directly injected into an oil layer without being processed and has a good plugging effect.

The invention provides a temporary plugging agent for horizontal well water control, and a preparation method and application thereof. The temporary plugging agent for horizontal well water control comprises the following raw materials in parts by weight: 4-15 parts of acrylamide, 0.5-3 parts of polypropylene fiber, 1.5-4 parts of reinforcer, 0.5-1.0 part of composite crosslinking agent, 0.1-0.2 part of initiator and the balance of water, totaling 100 parts. The composite crosslinking agent is a mixture composed of polyethyleneglycol diacrylate and N,N-methylene-bis acrylamide in a mass ratio of 10:(1-4). The preparation method of the temporary plugging agent comprises the following steps: sequentially adding the acrylamide, polypropylene fiber, reinforcer and composite crosslinking agent into water, stirring uniformly, adding the initiator, and standing to react for 1-3 hours, thereby obtaining the temporary plugging agent. The invention also provides application of the temporary plugging agent in horizontal well water control. The temporary plugging agent provided by the invention has the characteristics of high gelling viscosity, controllable degradation time, thorough degradation and the like, can plug the high-permeability zone and implement adjustable degradation time, and can lower the damage to the reservoir.

This invention describes a process for preparing a new copolymerized and cross-linked granular profile control agent. The process uses two organic monomers, acrylamide and acrylic acid, as the major raw materials, bentonite or montmorillonite as the reinforcing agent, ammonium persulfate or potassium persulfate as the initiator, potassium metabisulfite as the reductant, and N,Ní»-methylene diacrylamide as the cross-linker to synthesize the granular profile control agent. Since the process uses bentonite or montmorillonite as the reinforcing agent, and ammonium persulfate or potassium persulfate/potassium metabisulfite as the oxidation-reduction system, ití»s easy to operate and the PH value is adjustable.

The invention provides a filtration-reducing agent for oil well cement, which is used in well drilling and well cementing processes of petroleum and natural gas to reduce filtration of cementing paste. The filtration-reducing agent is a penta-copolymer, and a copolymerized monometer is 2-acrylamide-2-methyl propane sulfonic acid (AMPS), N, N'-dimethyl acrylamide (DMAA), unsaturated monocarboxylic acid, unsaturated dicarboxylic acid, and N, N'-methane biacrylamide (MBA). The filtration-reducing agent has favorable filtration reducing performance and rheological performance, and wide applicable temperature range, and is suitable for fresh-water and salt-water cementing paste.

The invention discloses a method for preparing super absorbent resin by the graft copolymerization reaction of carboxymethyl potato starch, acrylamide, acrylic acid and sodium salt thereof, which comprises the following main processes: carrying out neutralization reaction between a sodium hydroxide solution and acrylic acid from which polymerization inhibitor is removed under the cooling of ice-water bath; mixing acrylamide with de-ionized water to obtain an acrylamide solution; mixing the carboxymethyl potato starch with the prepared acrylic acid and the sodium salt solution and the acrylamide solution; adding an evocating agent persulfate and a cross-linking agent N,N'- methylene-bisacrylamide; stirring the mixture under room temperature; heating the mixture by water bath to rise the temperature so as to ensure that the carboxymethyl potato starch, the acrylic acid and the sodium salt thereof and the acrylamide generate graft copolymerization reaction under the protection of nitrogen; keeping the temperature of the reaction; drying and crashing to obtain the super absorbent resin with high potassium content by using carboxymethyl potato starch as the raw material. Compared with the similar products, the water absorption of the super absorbent resin is greatly enhanced; the super absorbent resin contains nitrogen nutrition element, does not need pasting in comparison with theprocess of directly using starch and greatly improves the preparation process. The super absorbent resin has great effect on the water conservation, the desert control, the plant growth promotion andthe like of soil in dry regions.

The invention discloses a method for preparing super absorbent resin by using carboxymethyl potato starch as the raw material, which comprises the following main processes: carrying out neutralizationreaction between a sodium hydroxide solution and acrylic acid from which polymerization inhibitor is removed under the cooling of ice-water bath; mixing carboxymethyl potato starch with de-ionized water; mixing the prepared acrylic acid and the sodium salt solution thereof with the carboxymethyl potato starch solution; adding an evocating agent persulfate and a cross-linking agent N,N'- methylene-bisacrylamide; stirring the mixture under room temperature; heating the mixture by water bath to rise the temperature gradually so as to ensure that the carboxymethyl potato starch and the acrylic acid and the sodium salt thereof generate graft copolymerization reaction under the protection of nitrogen; keeping the temperature of the reaction; drying and crashing to obtain the super absorbent resin by using carboxymethyl potato starch as the raw material. Compared with similar products, the water absorption of the super absorbent resin is greatly enhanced, the process of pasting is omitted incomparison with the process of using starch as the raw material and the preparation process is greatly improved. The super absorbent resin has great effect on the water conservation, the production of the physical hygiene sundries, the environmental improvement, the desert control, the plant growth promotion and the like of soil in dry regions.

The invention belongs to the technical field of high polymer materials and specifically discloses modified chitosan/nanocellulose composite aerogel and a preparation method and application thereof. The preparation method comprises the following steps: letting pretreated chitosan react with a hydrochloric acid solution, adding dithiobispropionate, and reacting to prepare modified chitosan; dissolving modified chitosan with an acetic acid solution, adding nanocellulose and fully reacting; adding potassium peroxodisulfate and uniformly mixing; adding acrylic acid and NaOH solution and fully dissolving; adding a N,N'-methylene bisacrylamide solution to prepare modified chitosan/nanocellulose composite aerogel, and freeze-drying to obtain the aerogel product. The prepared modified chitosan/nanocellulose composite aerogel has efficiency and enhanced adsorptive property, and has a remarkable effect of adsorbing heavy metal Cu<2+> with low concentration. Meanwhile, the preparation technology is simple and has strong operability.